The core infrared theory for getting this tutorial working was already described in the Infrared Receiver tutorial, so I`ll run through an abridged version here. First I`ll describe as an overview what infrared is and how it relates to our lives, then I`ll go further to how we can transmit digital data over this wireless link. The way that the inf
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rared transmitter and receiver pair works is similar to the way that our eyes work. We can see many different colors and depending on what we see, we act. The phototransistor functions in a similar way, it reacts depending upon the intensity of infrared light being shined at it. The real difference between the two similar cases above is that our brains already have a way to interpret the different wave lengths of color, where the infrared LED and phototransistor need some intelligent electronics in order to know what to do when certain data is transmitted. If you`re still scratching your head in confusion as to how 0`s and 1`s can be transmitted using the IR emitter and phototransistor, then build the circuit seen below and it should help make things more clear: Here`s how the circuit above works: The 9v battery is hooked up to both the IR Emitter and Phototransistor. The IR Emitter, however, is never turned on unless you press the push button. Since the emitter is not powered on, the phototransistor won`t allow current to flow through it, so current will instead flow through the red LED. This means until you press the push button, the red LED remains on. After you press the push button, the emitter shines brightly at the phototransistor and the red LED turns off. Here`s a video of this circuit in action: This should give you a much better visual of how digital 0`s and 1`s can be transmitted wirelessly using these two...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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